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No exploitation reportedAwaiting NVD analysis

CVE-2026-129427

Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO

No exploitation reported by the sources we read.

  • Published2026-11-14
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO in Cervantes version v1.3-beta could allow an attacker to execute arbitrary code in another user's browser with elevated privileges

Timeline

dates in UTC
  1. 2026-11-1411:19CVE publishedCNA

Versions per branch

Products declared by the CNA

As Grayback, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • CervantesSec cervantesother versions: not affected
    Affected
    • ≥ alpha 0.3, ≤ 1.3-betano fix statedcustom

    Not affected = v.1.4.0-beta

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-14

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-129427 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-14
  • CNACVSS 3.18.72026-11-14
  • CNAweakness (CWE)CWE-792026-11-14

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Published
2026-11-14

Frequently asked questions

What is CVE-2026-129427?

Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO in Cervantes version v1.3-beta could allow an attacker to execute arbitrary code in another user's browser with elevated privileges

Is CVE-2026-129427 actively exploited?

Active exploitation of CVE-2026-129427 has not been confirmed.

What is the CVSS score for CVE-2026-129427?

CVE-2026-129427 has a CVSS v3 base score of 8.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

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